Indenting machine



June 1945. R. N. SANDBERG INDENT'ING MACHINE 7 SheecQs-Sheet 1 Filed July 24, 1942 J 1945 R. N. SANDBERG 2,317,377

INDENTING' MACHINE Filed- July'24, 1942 7 Sheets-Sheet 2 Fig. 3.

June 5, 1945. R. N. SANDBERG 2,377,377

INDENTING MACHINE Filed July 24, 1942 7 Shet s-Sheet s June 1945. R. N. SANDBERG INDENTING MACHINE Filed July 24, 1942 "(Sheets-Sheet 4'.

June 5, 1945. R. N. SANDBERG INDENTING MACHINE 7 Sheets-Sheet 6 Filed July 24, 1942 June 5, 1945. R. N. SANDBERG INDENTING MACHINE Filed July24, 1942 7 Sheets-Sheet '7 Patented June 5, 1945 INDENTING MACHINE Robert N. Sandberg, Beverly, Mass., assignor to United Shoe Machinery Corporation, Flemington, N. J., a corporation of New Jersey Application July 24, 1942, Serial No. 452,241

55 Claims.

This invention relates to indenting machines and is herein shown as embodied in a machine for making ornamental indentations or imitation stitches in the top face of a welt secured to the outwardly, projecting marginal portion of a sole attached to a welted shoe or, in the absence of a welt, for making such indentations in the top face of the projecting marginal portion of the sole itself.

The primary object of the invention is to provide an indenting machine of novel construction and operation by which the work is operated on more rapidly and uniformly than heretofore, regardless of the type of work or variations in the work thickness.

It is a further object of the invention to provide an indenting machine having simplified mechanism for actuating the operating instrumentalities of the machine, including the indenting tool, so as to indent and feed the work as well as burnish the indented portion of the work. Moreover, it is an object of the invention to reduce to a minimum noise and vibration both of which are usually the result of thesimultaneous operation of a series of cam-operated trains of mechanism for actuating the various oper ating instrumentalities of the machine .or imparting various motions to one of these operating instrumentalities.

A still further object of the invention is to provide a satisfactory work-feeding movement, preferably a continuous work-feeding movement, in machines of the present type, and for so constructing and arranging the various operating'instrumentalities of the machine that they do not tend to retard or otherwise to disurb the work feed but, on the contrary, participate in that feed, if necessary. I

With the above in view, the illustrated machine, which has an indenting tool and a support for the tool, is provided in accordance with one feature of the invention, with a single mechanism, preferably an eccentric-operated or crankoperated mechanism for continuously moving the tool support in a closed orbital path heightwise and transversely of the machine so as to impart to the tool a work indenting and a work feeding motion. In particular, upon downward movement of the tool support, the tool is caused to impinge upon the top surface of the welt and to indent that surface, whereupon, as a result of the succeeding movement of the tool support in the direction of feed, the tool is moved in that direction while remaining in contact with the work and, in case of additional feed instrumentalities being provided, the tool is thus caused to participate with such other instrumentalities in the feeding of the work. This manner of tool operation is particularly advantageous in view of the resulting reduction of noise and vibration as well as the lessening of wear and tear in spite of the increase in speed. As illustrated, the indenting tool is supported on a front eccentric strap which is actuated by an eccentric secured on a continuously rotating shaft.

In accordance with another feature of the invention, the illustrated machine is provided with improved mechanism for imparting burnishing motions to the tool and to that end a rear eccentric strap is provided to move parallel to and in a direction opposite to the movement of the above-mentioned front eccentric strap. This rear eccentric strap also is actuated by an eccentric mounted on the same rotating shaft as the firstmentioned eccentric and at the rear thereof and, furthermore, this rear eccentric carries'a cam which engages the tool and imparts repeated burnishing motions to it.

A still further feature of the invention resides in the provision of means for predetermining the depth of penetration of the tool into the surface of the work, hereinafter termed the indentation depth, and this particular means is adjustable in accordance with the type and thickness of work operated upon. To that end the tool is carried in the illustrated construction, by an arm which is mounted on the tool-supporting front strap for movement relatively thereto and which, upon downward movement of the strap, is arranged to engage an adjustable stop serving to terminate the downward movement of the arm and, accordingly, to determine the indentation depth, while permitting continued downward movement of the strap. As previously stated, the tool supporting strap not only moves heightwise of the machine but also transversely of the machine in the direction of feed and this latter transverse movement occurs while the tool is in engagement with the work. By reason of the fact that the tool-carrying arm is mounted on the strap, the arm as well as the tool is constrained to move with the strap in the direction of feed, thereby imparting to the tool a work feeding motion.

In indenting machines of the above-defined type provided with work-supporting tables, it is customary to mount the work table for movement heightwise of the machine so as to enable the operator to insert the work in the machine as well as to enable the work table to accommodate differentthicknesses of..the work. Moreover, in

shield certain movable machine parts. The front portion of the overhang 28 is anchored to the portion of the head 24 immediately beneath it by a vertical pin 38 the ends of which are secured in the 'head 24 and the overhang 26, respectively, by screws 32.

The principal o erating or work-handling instrumentalities of the illustrated machine comprise a work-supporting table 34, an indenting tool 36, a guard member 38, and a presser foot 40. The work-supporting table 34 (Figs. 1 and 3) is mounted both for movement heightwise of the machine and for-rotation about an inclined axis. Thewelt-indenting and burnishing tool 36 (Figs. 3, 8 and 9) is shaped roughly in the form of a hammer and provided with two elongated teeth arranged in juxta-position on its work-engaging surface. The tool is mounted, as will be described, for movement heightwise and transversely of the machine so that the tool has a work indenting and a work feeding motion. Moreover, the tool is mounted for rotary motion in a direction at right angles to the vertical plane in the line of feed F (Fig. l) as well as for movement along the line of feed. The guard mem ber 38 (Figs. 1, 3 and 9) serves to protect the upper portion A (Fig. 9) of a shoe, presented to the machine for the purpose of having its outsole B or a welt thereon indented, against possible damage which may result from the indenting and burnishing action of the tool 36. The guard member 38 also serves as a gage determining the position of the work heightwise of the machine. Finally, the presser foot 40 (Figs. 2, 4 and 8) serves, by engaging th marginal portion of the outsole B and clamping it against the rotary table 34 during a certain period of a cycle, to assist in the feeding of the work.

The driving mechanism of the machine comprises the following principal parts: A motor 42 (Fig. 3), the operation of which may be initiated or terminated by a suitable switch (not shown), is securedto a bracket 44 bolted to the lower frame portion 20. Secured to the end of the rotor shaft of the motor is a pulley 48 the rotary motion of which is transmitted by a belt 48 to a pulley 59 secured to one end of a main shaft 52 mounted in suitable bearings in the machine frame. Secured on the main'shaft 52 is a second pulley 54 which is in driving engagement by means of a belt 56 with a pulley 58 (Figs. 3 and 12) secured on a countershaft 60 also mounted in suitable bearings in the machine frame. In addition to the pulley 58, the countershaft 60 carries a pulley 62 secured thereto which is connected by a belt 84 (Fig. 3) with a pulley 68 on shaft 68 (Fig. 1). The shaft 68 is mounted in hearings in a gear reduction box which is part of a work table supporting assemblage and is ar-' ranged for movement heightwise of the machine. In particular, the shaft 68 serves to impart rotary movement to the table 34. Heightwise movement of the shaft 58 with the work table supporting assemblage is permissible without interruption of its driving connection with the countershaft 88 by reason of the belt transmission between the shafts 60 and 68. secured n the countershaft 60 is a third pulley (Figs. 3 and 12) which is connected by a belt 12 to-a pulley '14 mounted on a shaft Hi (Figs. 3. '7 and 13) serving to operate the indenting tool 38.

The above-mentioned pulleys 54 and 58 secured on the main shaft 52 and the countershaft 60, respectively, are of the V-groove type and are adjustable by mechanism to be described to. vary simultaneously the positionsradially' on "the pulleys at which the belt will run in the grooves of the pulleys, thus varying the speed of operation of the entire machine. Moreover, the abovementioned pulleys 10 and' 'H'secu'red to the countershaft 60 and the'tool-operating shaft 76,

respectively, are also of the V-groove t'y'p and are adjustable, by difierent adjusting mechanism to be described, to vary the'speeds'of their belt contacting portions so as to" vary 'the speed of operation of only theindenting' tool 36,'thereby varying the number of indentations provided in the work surface for a predetermined linear distance along the lineof'feed-F.

For the purpose of simultaneously adjustin the speed of the pulleys 54'and58, there is movably mounted in suitable brackets' fixed in the machine framea pin I8 (Fig; 3) to which sliding movements along its longitudinal axis may be imparted by the manipulation of a'treadle rod 88' The upper extremity of the treadl rod is connected to the sliding pin 18 by'link and lever mechanism 82 (Fig. 1) engaging'acollar 83 on the pin 18. Secured on the sliding pin 18 is a forked arm 84 (Fig. 3) which is in operative engagement with the hub 86 of one half or section relatively tosthe other halfof' thepulley 58 on movement of the sliding pin 18 to' vary-the peripheral velocity of the belt-engaging portion of the pulley 58 simultaneously with the corresponding speed'adjustment of thepulley 54;

Considering now more specifically the ."work table assemblage and its supporting mechanism of which, as stated, the above-mentioned pulley '66 and the table drive shaft 68'are'a part'at least to the extent of participating in the heightwise movement of that assemblage; it'is to be noted that the rotary motion'of the shaft 88 mounted in hearings in a reduction gear-box 88' '(Figs. 1

and 3) is reduced in speed-by reduction worm and worm gear mechanism'flil (Fig.1) h'ousedin the gearbox 88.

For the purpose of facilitating h'eightwise movement of the reduction gear box 88 together withthe shaft 68 and pulley 88. the goar bo'xis provided with a sleeve-like guide'member 92 (Fig. 3)

having a sliding fit on-the above-mentioned pin 30 which connects the overhang ZB-With the head 24 of the machine. i

Mounted in bearings inan upward extension of the gear box 88 is a vertical stub shaft 94 (Fig 1) which is in driving engagement with they reduction gear mechanism and'u'pon the'freely extending upper end of the shaft there is secured a gear 88. The gear'86 is i'n'meshin'g engagement with a helical gear '98 (Figs. 1 and 5) secured to the lower end of an inclined-shaft [88 mounted in suitable bearings in a block I82. Thegear mechanism 98, 88 is shielded by 'a acover 183 (Fig. 3) omitted from Fig. 1. Secured to the upper end of the shaft I08 is the table 84 and.

as may be readily seen, there'is-an uninterrupted train of driving mechanismbetween the table and the continuously rotating shaft 88. g

The table is provided in its upper surface with an annular rubber insert I04 comprising a hard rubber body with a soft rubber toplayer protruding-,somewhat-lahovethework-engagingsurtace of the table-so as to-preveatthemediate of-the sole 3 frombeingmarredlby the table when the work is clampedtheieagainshas well-.as-to facilitate the work-.feeding operation of thetable. by providing suitablegiriction between-the table; and the work. I

abovermenticned-block I02 in which; the incline'dshatt I is-rotatably mounted is part of the heightwise'movable. table assemblage and is connected to the. reduction 2 gear lbox :88.;by a curved-arm I08-'(Fiss..;3% and. 5)-. The-arm I06 is secured'atit8'upl78 '=endtortheoblock I02 by screws I08 and the lowerzendof the arm I06 is operatively-connected:to;a bossor socket I2I.:0 (Fig. 5) provided on ,theyizeduction'. gearbox188'. A: stud I I2' extendsthroughza borer-H4 (Fig; :16) in the lower end'of .thearm-IM, the-bore beingjpitovided withran internal'wannnlar flange H6 receivinga head'Hlof-therstud H2; .The-lower-endof the stud II2 is:inzthreadedzenuaaementwith the;boss IIO. The-stud I I 21s surroundedzby-a spring I the lower-end oi-whiclris seated" upon ashoulder provided in the-socket, The upper end of the spring I20bears against-z-the annular flange I156. The purpose of; this arrangement, as: will be readily-seen, is :to provide-2a yielding connection between the block Il2 supporting the shaft I00 andtable 8& on thei-one: hand-and; the reduction gearbox on-the other hand. Thus-a downward yield of the table fl inelativelyitotthe .gear box 88, which is maintainediin-its elevated position during the entiro-tmachine operation, is possible upon .increaserinswork thickness. Should the work thicknesszdecreaae the table will automatically adjust itself andrise under the pressure of the :spring' I20-into-its new position to-accommodate the workportion of reduced thickness; Moreover, if thegear-box, .uponr-release of the treadle, is lowered. hitodtsxinoperative, position, the table is caused-to-move downward with the gear box dueto the ensflsementofthe head N8 of the stud II 2 with-ithettop suriace of-theannular flange H6.

Forthe purpose of elevating the table-supporting and rotating-assemblage comprisingq the gear box 88, the. mechanism housed-therein as well as the table'iil andtable-supporting block I 02, there is mounted insa recess provided in the: bottom portion of the gear box 88 a freely-rotatingsroll I22 (Figs. 1 and f3-) --whichi s engaged by acam member I2lpivota1lyvsecuredt-on a fixed screw I 28, positioned ecoentrically relativelyto the rollengaging curved'suriace oiz-the "cam member I 24. To rotate the cam member 124 about the-pivot "screw I26, the cammember is'connectedby-allink I28 to a bell crank lever I30 mounted forrocking movement about-a; 'flmqdr'pivot pin; I32; A- short horizontallyextendingfarm'ottheibelltcrank'lever I30-isipivotally oonnectedwit-hrthe-upper end oratreadle rod- I84: which rmay b,e-moved heightwise oi the 'machineby a treadle'imechanism'tohe described. Downward? disnla ementor thetreadle rod I31 causes amnespondingamcking movement:

of thewcammemher :I lliabout thepivot" screw-I126.

and by reason-oitheweccentricitymfithe {roll-ena ing-surface ofthe -camzmember- I24: Withrl81&-

tion to the axis of.-rotationof: theicam member;

the gear box'ral aand the entire assemblagesup ported .byuit, including; the Work. table,- are el vated. A spring Ill-"(Elam Land 3*) connecting, the treadle operatingzthe treadle rod I with thetop ohthelowerr frame-portion 20i-serves toelevate theltreadle mechanism and to maintain the itreadle. 1:84 in: its uppermost position 1 with. result.- that, whens-inoperative, thetable assemblage. occupies its lowermost position. In order to determine adjnstably the upp rmost position ofw'the. tableoassemblage, there is mounted in abracket secured in the: machine head 24 a stop screw I88 (Fig. 1) the lower-end of whichis engaged by theupper face or the gear box 88 upon elevation 01 the latter, the screw I38 'being so-adjusted that'even it the-table is elevated without ashoe oniit, the table cannotfoul the indenting tool 80. A spring 140 (Fig. 3) connecting the gear box with the topofthe. lower frame portion I 20 tends to pull 1 thetable assemblage into its lowermost inoperative position.

To facilitateheightwise' movement of the: tablesupporting block I02 with'the gear boxll-the block is. provided -with a-guideway 2 (Fig. .6) which .is "engaged by azdovetailedy guide member provided on ablock-I (Figs. 3 and'19) secured:

in the -machine head 24.

To'preventra downward yield of the-work'table 34- under the workimpinging impact of-the indenting tool and; while the latter is presdng against the work, the table is locked against heightwise movement. during acertain period 0! each operating cycle ofthe'machine. To this end; the table-supportingblock I02 is provided at its rear face'with-a recess' 8 (Figs; 6- and 18) having side walls I48 that are arranged at anobtuse angle relatively-to the bottom or thearecess- M6 to provide locking :surfaces. The-recess 6' is engaged by a locking plate I-50- mounted-for movement relatively to therecess so :astoncaul either a binding'of the angularlydisposed-edge faces I52 of the locking plate I50-with the side walls I48. of the recess Ste-prevent heightwise movement of the b1ockt02- or to free "the'block I02 for heightwise movement. The locking plate IE0 is pivotally secured to-a locking-block I'M mounted for tilting movementpn an eccentric portion of -a pin I56, thetiltins" movement of the block I 54 inone direction: or theother resulting in a locking orunlocking of the table. The; pin

I 56 isheld in position-in the machineframe by a set screw I88 illustratedin Figs. 18eand-19. For

thepurpose. of tilting-the block' I I, it is provided with a rearward extending'fmger I80. The r-rec end of the finger I60 is- 'engaged' in a-recess I (Fig. 6) provided in a-.10ckingpin. I82 mounted for vertical sliding movementin-a bore provided in the fixedxblock I. Thelockingpin- I62-has secured to its upperendablock-shaped head I into the upper surface of which: is out a guideway I88 engaged by ahardened steel block I10 which may be adjusted along. theguideway and which during a certain period ofan operating cycle of the machineis engaged by means to be described for-the purpose of depressing the looking pin I62 and releasing the locking plate I80. The table-locking mechanism is normally held in its operative locking position .and to this end,

there is provided an "axial bore I12 (Fig.4). in

the lower-portion of-the'lockingzpin I82'and seated in this bore is the upper end ofa spring I. The lower end of the spring rests-against-ascrow I-IB threaded into the lower end of the heroin which the pin I62 is movable. It isapparentthat the spring tends to'displaoe the locking'pin I82 upward thereby rocking the locking block I84- in a counterclockwise 'directiomas viewedin Fig; 6, so as to'move the looking. plate I50 intolockin engagement with thezside walls I48 otthez'reeess 146' provided in the table-supporting .block I02. It is furthermore-to-be noted'that the'temporaryrelease of the locking mechanism 'by the the machine.

application of pressure to the above-described hardened block I10 is effected against the pressure of the spring I14 and that, as soon as the lock-releasing pressure against the block I10 is removed, thetable lock is immediately restored to its operative position by the spring I'I4.

As previously mentioned, the illustrated machine is provided with a shoe upper guard 38 which simultaneously -acts as a shoe gage to determine the heightwise position of the shoe in This guard and gage mechanism is constructed as follows: A web-like supp rting member I18 (Figs. 3 and 4) is mounte for pivotal movement heightwise of the, machine on alined pivotscrews I80 secured in a bracket I82 provided on the front cover 28 of the machine. The web-like member I18 carries the above-described plate-like guard member 38 which is made of spring steel and is attached byscrews I84 to. the web-like supporting member I18. Moreover, the supporting member H8 is provided with spacer screws I86 extending rearwardly therefrominbo engagement with a finished surface I88-on the front cover 28 to maintain the web-like member I'IBgand therefore the guard member 38 supported thereon at a predetermined distance from the finished surface I88 and therefore at a predetermined adjustable position in the machine. The operative position of the guard and gage member 38 may be varied by an adjustment of the spacer screws I88. Moreover, due to the mounting of the supporting member I18 on alined pivot screws I80, the entire gage and guard mechanism maybe swung out of its .operative position upward about the common y axis of the pivot screws I80 so as to obtain access to the machine parts normally shielded-by the u r m anism.

The above-mentioned indenting tool 36- performs the important function of indenting the i protruding marginal portion of the sole or the surfaceef the welt attached to thesole, if such be h ascl by a i in in a on, on. thcwo k surface. The impinging movement ofthe 'tool,

as will be described, is in a direction both downward and forward toward the work so as to-cause the tool to enter deeplyinto the crease between the welt or sole B and the upwardly-extending portion of the shoe uppc irA, as illustrated in Fig. 9 of the drawings. Moreover, the;tool 3 8 :has the function of burnishing the indented-portion of the work and, finally, of participating with other work feeding instrumentalities in the work feed.

For the purpose of imparting work-indenting and work-feeding movements to the tool 36, there isprovided an eccentric I90 (Fig. 7 and 13) near the forward end of the shaft Hi, this eccentric hereinafter.beingreferred to as the front eccen. trio. Mounted on the front eccentric I905is an eccentric strap I92 (Figs. 7 and 13) hereinafter referred to as the front strap. The front strap I92 has aheightwise extending slot I94 which is engaged by a trunnion block I96 rotatably mounted on a fulcrum stud I98. The fulcrum stud is provided at its forward end with a flanged head 200. As will be described; the fulcrum stud I88 is adjustable heightwise to vary the lateral throw of-the eccentric strap seats to vary the feed movement of the indenting tool.-- 1 p To supportand operate the indenting tool'36, thefront strap I92 has pivotally secured tov it a tool-carrying arm 202' (Figs. 4, 7 and 13) 'provided with a forked end 204 embracing a portion of the strap I92; and being mounted on a sleeve 205 extending through that portion for pivotal movement relatively to the strap and being held in place by a screw 206 extending through the sleeve. The tool-carrying arm 202 has a downward extending projection 208 nearer its freely extending end and this projection 208 is normally held in engagement with an abutment 2I0 provided on the strap I92 by a spring 2 I2 which connects the free end of the arm 202 with the lower curved end 2I4 of the strap I92. As will be seen, due to the action of the spring 2I2, the arm 202 and the front strap I92 move as a unit in an orbital path on rotation of the eccentric I and rocking of the front strap I92 about the fulcrum stud [98 V Toprovide for an adjustment of the tool 36 along the line of feed, the tool is not rigidly mounted on the tool-carrying arm 202 but rather one forked portion of the arm is provided in its outer face with a guideway in which is mounted a sliding member 2I6 ;(F igs. 4, 10 and 18), the sliding member 2I6 having a slot 2I8 through which the above-mentioned pivot screw 20B extends. Accordingly, the sliding member 2 I6 m ay be adjusted along the guideway relatively'to the arm 202 and may beheld in adjusted position by the clamping actionof the head of the screw 208 on the member 2I6. The tool 38 is-mounted on the sliding member 2I6 of the tool-carrying arm 202 in the following manner: The freely extending end of the sliding member 2": is in the shape of a block 220 (Fig. 10) This block 220 is-provided with a bore 222 extending at right angles to the vertical plane in the line of feed F (Fig. 1) and mounted in this bore 222 is apin 224 having a reduced portion 226 (Fig. 8) extending rearward from the block 220 and being provided with a flanged head 228. A forked plate 230 secured to the rear face of the block 220 engages the reduced portion 226 of the pin 224 and serves to hold the pin 224 against the movement lengthwise of the bore 222. The forward extremity of the pin 224 is enlarged and servesas the tool holder proper. It is provided with two spaced vertical flanges 232 between which the indenting tool 36 is mounted to rock on a fulcrum pin in the form of a screw 234 extending through the spaced flanges 232 of the pin 222 and. extending througha recess in the lower portion of the indenting tool. The screw 234 is secured in place by a nut 236, as illustrated best in Fig. 10. Secured at one end in a hole through the flanged head 232 of the pin 224 and confined between the right-hand flange 232 (as seen from the front of the machine) and the flanged head of the screw 2341s a torsion spring 238 the other end of which extends upward into engagement with a pin'240 extending laterally from the tool, the spring 238, tending to rock the tool 3'6 rearward of the machine about the axis of the screw 234. By releasing the screw 234 and nut 238 the tool maybe quickly removedfrom the machine and another tool, designed to produce a diiferent number of indentations per linear unit, may be mounted in the machine.

The pin 224 may rotate in its bore 222 relatively to the block 220 of the sliding member flfi to permit a movement of the tool 36 about the axis of the pin 224 along the line of feed and this possible movement of the tool 38 is primarily intended to compensate for the differencein the rate of feed movement of 'thetool-and other work-feeding instrumentalities. To prevent M the tool 36 from rocking freely about the axis of the pin 224, the block 220 is provided above the bore 222-withanotherbore 242-(Fig, 8-)- ofsmaller diameter than the bore 222 rand-extending parallel thereto. Mounted inthe bore 242 is a centering pin 244 which .is pressed forwardby-- a spring- 246 seated in the-bore '242 and engaging thecentering pin 244 .so that the-pin -244-extends outward of -the-block- 2-28-into -a conical recess 248-provided in the rear wall of the-enlarged'front end of the-'pin 224; Af-ter displacement of -the indenting tool 36' along I the line of feedrelatively tothe block 220, the centering pin 244-which-has a rounded frontend causes, -by--reason oi -its cooperationwith the conical recess 248, thetool 26- to be returned to its-normal vertical position.

As previously explained, the tool-supporting arm 202 is held'by thespring 2I2 in contact withthe abutment-2I0- of the front strap- I92 sothat normally-bottl the front strap-l92 and the-arm202 move as a unit in anorbital-path due-tothe rotary movement of theeccentric I90 and the rocking movement ofthe 1 front strap about the axis of the fulcrum stud-I98. Forthe purpose of -adjustably- -determiningthedepth of penetrationof the toolinto the-worksurface a (indentation depth) a relative movement between the tool-supporting arm 202-and-the--front'strap I92 is brought abouttowardthe end of thedownward leg ofthe-orbital movement-ofthe strap I92. To this end; there is providedan adjustablestop 260- (Figs: band-19) -to-be engaged'by the lowerportion of the block-228 of thesliding member'2I6 secured in the arm-282.- When-on downward movement of the front strap- I 92 -together with the arm-262, the-block 228 of'the sliding-member2l6 strikes against the stop259, the downward movementof the arm282and the tool is terminated while the front strap I92 continues its downwardmovement. Asa result of the relativemovement between thefron-t strap I92 and the tool-carrying arm 292; the abutment 2H! of the front strap becomes separated from the projection -208-of the arm 202. Afterithe front A strap 1 92' has reachedthe lowest point of its orbital path it immediatelybegins to rise again due to thecontinued-rotation of the eccentric I90-, but the tool-supporting-arm --202- only moves again withthe front strap I92 asa unit after the abutment '2 I 0! the front straphas-reengaged the projection 298 o-the arm 282, this-taking place some length of time after thefront-strap has reached its -lowesvpoint and has begun to rise-again; As will be-noted, during-therelati-ve movement of the front strap .I92-and the toolcarrying arm- 202, the -frontst1=ap I82 w5nenit moves through'the lower arc: of its orbital path not only moves heightw-ise ofthe machine but also laterally-thereofalong -the line of feed so that the arm 202 by reason. ofits pivotal connection with the frontstrap .I92 is constrained to participate in the latters lateral movement while-the tool 39 -is-he1din engagement with the work. Consequently; thetool is tcaused to impart a forward movement to the work duringand as a result of the lateral movement -oithe strap The adjustable stop 250 for -the arm 202 is-provided on a triangular lever'262 (Fig.4) which is fulcrumed on a pivot stud-264.- One side-or the triangular lever'262 is engaged by -a-wedge 258 which, upon elevationcauses the triangular lever to be swung in-acounterclockwise direction, as seen in-Fig. 4; to move the stop-2501mm airinoperative into its operative position-which; is determined by an adjustable stop pin- 258 mounted in the machine frame and-engaging a lipped poragar-7 377 tionof the triangular lever 252.- For thepurpole of operating the wedge 256 to-elevatethcstop-m into its operative position and hold it in that position, the lowerend-of the wedge 256 hasapinand-slot connection 262 with a wedge-operating lever 260 pivotally secured on-.s; fixed fulcrum stud 264. Pivotallysecured to the wedge-operating lever 260 isa-rod 266 which loosely engagos a bore 268- (Fig; 1'1) provided in the abovedescribed reduction-gear box 88. The rod! is surrounded by a spring 216, the upporend-ot which bears-against a forked head ot the rod *266 and the-lower end of which-is seated in tho'bore 268 with the result that, upon elevatiomof-the gear box88 to move-the table 34 into its opentive position, the lever 260'is-yioldingly rotated in 'aclockwise direction, as seen in Fig.- 4'; toolsvate the wedge 256 -which,forthatpurpose-Is guided for vertical movement in the frame and which thus causes the. stop 258-to'bomovod into its elevated operative position. The purpose of mounting the tool stop2i8 to move betweenmn operative and an inoperative: position amderthe control of the work table assemblage is to ,prevent :the tool-supporting mechanism from striking-upon the stop while themachine is idling,

thereby reducing noise as well as wear and tear.-

I To release the just-described wedge lock mechanism upon lowering the work table supporting assemblage including the gear box- 88; special mechanism, illustrated in Fig. 4, is provided which comprises abracket 212 secured on the gear box as-and provided with-a horizontal bore-in-which is received the stem of a stop arm 214 boredto receive a vertical rod 216- provided withya 8M m l-1 218 on its lower extremity and a heed-298 at its upper'extremity, the head ;being'pivotally secured to the above-mentioned-wedge-opemting lior imparting a 'burnishing motion to thetool 5 "a itas. imp e n t e Por i of th work surface to be indented; the following mesh;-

anismis provided: Mounted on the tool-operating shaft -16-isan eccentric 282(Figs .;'1-and'11)ylocatedrearwar d of the above-mentioned front eccentric I 96 and hereinafter termed the rear-eccentric. The rear eccentric isarranged with its portion [of greatest eccentricity disposed diametrically opposite to the coi respondingiportion ofthe eccentric I 99 and carries a strap 294 hereinafte'r termed the rear strap: v The rear strap-294 has, similarly-t the front strap, a heightwise extending slot 286 engaged by a trunnion block 288 which is mounted on the previously men tioned fulcrum stud I98 so that both straps I92 and 284 have a common fulcrum stud, As illustrated best in Figs. 11 and 110, the rear strap 284 is provided with a boss 298 extending forwardly thereof and supporting a cam block 282 which is secured to the boss by means of a-clamping screw 294. The cam block 292 has scam member 296 against which the indentingtoolfl is held by the above-mentioned torsion spring 238, the cam 296-serving,- as the result 01- the height-wise movement; of the rear strap 284 to impart burnishing movements to the tool 36 in a direction at right angles to the vertical plane in the line of feed F, as will be described.

As stated above, the fulcrum stud I98, carrying the trunnion blocks I96 and 288 is common to both eccentric straps I92 and 286 so that both straps during and as a result of their actuation by the eccentrics I90 and 282 are caused .to rock about a common axis in a direction laterally of the machine. In order to change the lateral throw of both straps I92 and 284 the common fulcrum stud I98 is mounted for adjustment heightwise of the machine. It should be noted. also, that in order to maintain a spaced relation between the two eccentric straps a spacer (not shown) is mounted on the fulcrum stud. I98 and is located between the two straps. For the purpose ofeffecting a heightwise adjustment of the fulcrum stud I98, the latter is securedat its rear end in a block 298 (Figs. 3 and 7) the block being guided in a portion of the machine head 24 for vertical movement with relation thereto. The block 298 is provided with a vertically extending tapped bore into which is threaded an adjustment screw 300 (Figs. 3 and 7) carrying at its upper end, a handwheel 302 and being held against vertical movement by a retaining plate 304 secured to the upper portion of the machine head 24. As may be seen, upon rotation of the screw 300 by means of the handwheel 302, the block 298 is adjusted heightwise of the machine and the fulcrum stud I98 accordingly is adjusted simultaneously in the same direction. To prevent the adjustment screw 300 from turning during the machine operation, the screw 300 is engaged by two friction screws 306 (Fig. 3) provided with binding springs and threaded into the block 298. 1

To vary the speed of the tool-operating shaft 16 for the purpose described, manually operable mechanism, shown best in Fig. 12 of the'drawings, is provided. This mechanism comprises a horizontal screw 308 the left-hand end-of which is in engagement with a tapped bore provided in a rotatable bearing 3I0, the remainder of the screw being slidably mounted in different portions of the machine frame. The bearing 3) is provided at its outer forwardly extending stemwith a handwheel 3I2 (Figs. 1 and 12) and the screw is provided at its right-hand extremity with a flanged head 3M. The hand wheel3l2 andthe bearing 3) are immovable in the axial direction of the screw 308 so that upon rotation of the handwheel an axial movement of the screw 308 is produced. Mounted on the screw 308-is a laterally extending arm 3I6 which participates in the axial movement of the screw 308 upon rotation of the handwheel 3I2. The arm 3I6 is in operative engagement with thebearing portion of one half of the previously described pulley M on the tool-operating shaft I6 and on movement of the arm 3I6 axially of the screw this half of the pulley 14 is moved with relation to the other half of the pulley so as to vary the circumferential velocity of the belt-engaging portion of the pulley 14. Similarly, the screw 308 carries another arm 3I'I (Figs. 3 and 12) which serves to move one half of the pulley relatively to the other half of that pulley to effect a simultaneous adjustment of the speed of its belt-engaging surface with the speed adjustment of the pulley l4.

Adjustment of the common fulcrum stud I98 of both eccentric straps I92 and284. by therotation of the handwheel 302 for. the purpose of 1 varying the lateral throw of both eccentric straps and thereby the number of indentations made per linear unit along the line of feed is effected in accordance with a graduated scale (not shown) provided on the machine frame and an index mark or the like (not shown). moving relatively to the scale. This adjustment by the rotation of the handwheel 302 is set proportionately to a simultaneous adjustment of the speed of the tooloperating shaft by means of the handwheel 3I2, the rotation of the latter being also determinable in accordance with a scale and index mark (not shown). The two scales are alike and may bear the consecutive numbers from 8 to 22 which is the usual range of indentations made per inch. If it is desired to increase the number of indentations made for each inch in .the line .of feed, the handwheel 3I2 is rotated until its index mark is in register with the number on the scale corresponding to the number of indentations per inch to be made, thereby adjusting the speed of the pulleys wand 14 to increase the speed of the belt I2 connecting them and thus to increase the speed of the shaft I6. Simultaneously, the handwheel 3| 2 is rotated until its index mark registers. with the same number. on its scale, thereby lowering the fulcrum stud I98 and shortening the lateral throw of both eccentric straps. Reversely, if the number of indentations per linear unit is to be reducechthe speed of the belt I2 and therefore of the shaft vI6 is reduced by the rotation of the handwheel 3I2 and, at the same time, the fulcrum stud] 98 is elevated to lengthen the lateral throw of both eccentric straps. Due to the provision of these adjustments, it is no longer necessaryin themachine of the presentinvention to exchange the indenting tool for an indenting tool of somewhat different design almost every time a change in the number of indentations per linear unit is to be made. Whereas, in prior indenting machines, at least fifteen different indenting tools are usually required to accommodate a range of indentations from 8 to 22 per inch, only five diiferent tools are required in the present machine so that the frequency of tool ex change typical of the former machines has been reduced about two-thirds.

It will be remembered that the sliding member 2I6 supporting the indenting tool 36 may be adjusted, by reason of the provision of the slot 2I8 therein, with relation to the arm 202 and this adjustment is preferably so effected that the tool is located at least in the median vertical plane of the machine, indicated by the line M in Fig. l, or, preferably, somewhatto the right of that plane (as seen in Fig. 1). This insures that the tool 36 engages the portion of the work which is being supportedby the segmental portion of "the work table rotating at that time toward its rearmost position in the machine so that the indentingtoolin cooperating with that segment of the work .table tends to move with the latter rearwardly. or inwardly. of themachine thereby insuring continuous contact of the work with the gage .88. Otherwise,, there may be danger of the work being, pushed out of the machine particularly if the tool 36-should exert its indenting pressure upon the portion of the work supported on the; segment of the. worktable rotating at that. time away from its rearmost position in the machine. It is to. be understood that the work table itself islocated in theexact center of the machine, or that, in other, words, its axis of rotation coincides, with the median. vertical plane ,M.Qf..the .machine. 1.; -1

'iSJOCMOd at 1 the Pighii hand-sid- *Oi the median intervai' plane" M of themachine: Thebracket fli has a bore 320- the. upper end ofwhichais open. A sleeved has a sliding fit in the-bore 320 and is provided with diametrically opposite vertical I slots fli-throughwhich extendsm'stud I 10 328,-one end of: which is secured in-thefront'cover M ami the otherzend in thebracket fll; the stud serving to limit 'heightwise movement of the slecve 324--w-ith relation-"to the-bracket 818 to Lthe extent otthe-slots-J; Integral with th'e lower end of the sleeve '324iis=:ablock .330 :and iinside of-thesleeveuthene isplofldedtu: spring lithe lower endiorwhich is: seated on thetopttace of the block 330 and the :uppenend or whichengages a recess a inithe fixed Stud- 328 Thus; the-aspi ing tends-to: depress the block 330 land rsleever 324 until the upper .endsof 'the slots-326 abut against theupin 1328. Flor the-purposev of securing the presser foot 40 to-the block: 330, the latter "is provided .vwithwa horizontal-bored whichuiszml gaged by astud utihaving at-its rearlend abayonet lock 338 engaging a rearward and downwardextendings portion .of the block 330. At its front end, therstudrreceives alpivot screw 040 :by means oi which'a verticallyaextending upperuportion. of l the; presser foot 40.;is; pivotally attached to the blockr330. The lower. portiomotthe presser foot is linclinedoutwardlzand. toward:.the left of the machinapas seen in Figs; 2uand.;4, so that it extendset anacute-angletoc'the vertical plane in the A line of feed -F The pivotal. mounting or the presser..;foot..40 on its supporting block 330 enables o the preset foot to; participate in the work-feeding. movement .of the work 1 table against which the presser foot holds the :work.

clamped :during' a. certain portion-of operating cycle. Thezmountinglof the. pressersfoot at the right-hand.side of the median; vertical plane 5M of:the machineeis. fore-the .samereason'as the adjustment of'cthe indenting tool into a similar. position, as previously. explained, namely, ,to enable the presser foot to cooperate-in. the feeding of. the. work-with. the segment of the; work table rotating towardits rearmost position in the machine lsoithat the lworkiszheldsin the machine and not iorced'out. I

To maintain the pressenfoot 40 in a normal position with relatiomto the-supporting block .330, thereis providedawire .spring1ri42 (Eig.:.8), one

end oflwhich: is clamped htoqthe. vertical upper 5,

portion of the presser foot byzthe. pivot screw 240 p and the other angularly deflected endotzwhich extends intoa-vertical groove 340 (Figs; 8 and 11) ,providedin a:bloclc i44 whichaisintegral with the I previously mentionedulcam. block: 202.- The block 344 I, is located beneath" the .lower face cot the presser foot supportingblock 2330 land; during the upward movementor rear;strap:204 and the concomitant elevation otxthe :bIock 344,-. the

latter is caused'to engage the'block' '330 and move a it together with the presser-foot "401mm: an elevated,i inoperative position Asimay beiseenp as soonas the rear. strap V204 begins. to :descend,.the spring 382 is'freed-to lowertheblock 330- and thepresser foot 40 "into their lowermost operative positions in. which thework; i clamped against the work table by: the presser loot.

Owing to the fact that-the two eccentrics'rlw and 202 are arranged diametrically opposite to each other, one 'of the straps iaomitl'downward stroke when theoth'er ison Its-upward stroke and -dur lnag='the continuous rotation of the work tablewt wReferringto Figssiy'l; 11 and 11a of the drawings-it will be noted that the boss 2900f the rear strap; 284 has: a downwardly extending bracket 348 provided: inlitsz lower surfa'ce with a groove 304 in -whichzissreceiveda block 352 pivotally secured on a pin 354 fastened in the bracket 348. The =lower-portionof the block! is connected :by -a=spring .l5iwith a pin fixed in the bracket 340 the spring. tending to hold the upper portion. of the :block against the bottom of the groove 300 sosthat blocklifi and rear'strap 284 normally-moveasa unit. Threaded into the lower portion of the/block 3524s a frusto-conical screw stud 35l l-which, upon downward movement of the rear.strap.204, is:caused.to strike upon the abovemen'tionedaz'hardened steel block I10 (Fig. 6) to depress-the lockingspin: I62 and release the lockingsplate li0 againstathe pressure of the spring I14.- his: to be noted that the table-locking mechanism'isereleased, asstated, on downward movementof ftherear strap 284, this movement also permitting'the presser foot to clamp the work "againstthe rotary table under the action of the SDIiligJZc While thistakes place, the tool-supporting front'strap: I92'is on its upward stroke and: elevates the toolinto its upper inoperative position. When thereafter the tool is moved into sosengagement with the work as a result of the iii) downward-"movement of the front strap I92, the screwstud 358 is elevated-by the rear strap 284 to cause thetable 24 to be automatically locked again by thespring. I14.

The-purpose or mounting the screw stud 358 on the block 352, movable relatively to the rear strap 204 but normallyheld by the spring 358 to move with the strap, 284-as a unit, is to prevent breakageoftha -machine parts if for some reason the drivingzmechanism ot the machine should be reversed; in-cwhich-casethescrew stud 358 would abut against the endof the steel block II0 from whichin" the normal operation it slides oil or snaps off,- without being able to rise on top of the block I10 which is normally maintainedin its elevated position by the spring I14.

As hassbeen explained above, the welt-indenting tool-'36 of the present machine is moved into engagement with the work'as a result of the downwardzmovement of the front strap I92 which is actuated to move continuously in'an orbital path. As a result of the work-impinging action of .the tool,-it is caused to penetrate the work surface'toaz predetermined depth of about of an vinch'and its further downward movement is then prevented by'reason oi the engagement of thetool-carryingslide 2I0 with the stop 250, while the eccentric strap I92 continues its downward movementr The tool remains in engagement with the workwhile' the strap I92 moves through thelower arc of its orbital path. The tool carrying arm1202 and the strap I02'again moveas a'sunit aiter the re-engagementoi the abutment= 2 I0 with the projection 208. During thearelativemovement or 'the 'tool-carrying arm 202 and strap I92, the tool 36 is caused to move in the line of feed because the tool-carrying arm 202 is constrained to move laterally with the strap I 92, it being pivotally secured at .206 to the strap. It has been explained furthermore that the rear strap 284 performs three important functions, namely, that of permitting the presser foot to engage the work during a predetermined period of time in one operating cycle, that of releasing the table lock during a predetermined period of time in one operating cycle, and that of imparting burnishing movements to the tool 36 while the latter is in engagement with the work as well as causing the tool when being moved into engagement with the work to follow a downwardly inclined path so as to cause the tool to move into the so-called welt crease of the shoe. Moreover, it has been stated that, since the two eccentrics I90 and 282 are angularly displaced 180, the two straps I 92 and 284 are caused to move in opposite directions heightwise of the machine so that the indenting tool 36 is moved into engagement with the work when the presser foot 40 is elevated into its inoperative position and the table locking spring I14 is permitted to lock the work table assemblage in operative position.

As illustrated best in Fig. 9 of. the drawings, the previously mentioned cam 296 supported on the rear strap 284 cooperates with a rearward- 1y extending hump portion of the indenting tool 36 in bringing about an engagement of the indenting tool 36 deep in the welt crease on downward movement of the tool as well as causing, by reason of the movements of both the tool 36 and the cam 296 heightwise of the machine in opposite directions, repeated burnishing movements of the tool while the latter is engaging the work, as will be described.

As stated, the indenting tool 36 and the presser foot 40 cooperate with the work table 34 in feeding the work substantially at different periods during one cycle. However, there is a slight overlap of work engagement at the beginning and termination of the work feeding motion of each instrumentality. In particular, the arrangement is such that, assuming a new cycle of operation starts upon engagement of the indenting tool 36 with the work surface, the tool has reached its indentation depth after about 15 of rotation of the tool operating shaft I6 from its zero position. Thereupon the tool remains in engagement with the work, i. e., at the level of the indentation depth, until the shaft has been rotated about 195, the tool then being elevated but not yet losing contact with the work until the shaft I6 has been rotated about 210. This indicates that the indenting tool 36 remains in actual contact with the work for 210 of one cycle. The presser foot 40 which at the beginning of the cycle is in contact with the work is lifted from the work at about 30 of the cycle I and remains out of contact with the Work until the shaft 16 has reached 180 of the cycle. This indicates that the work contacting periods of the indenting tool and the presser foot overlap at the beginning and the end of the work-feeding movement of each instrumentality and, as described, this overlap occurs substantially during the period extending between 0 and 30 of the cycle as well as the period extending between 180 and 210 of the cycle. It will be understood that by reason of the alternate cooperation of the indenting tool 36 and the presser foot 40 with the continuously rotating work table 34 and the fact position, which is as stated, at approximately of a cycle, the screw |bolt 358 as a result of the then downward movement 6f the rear strap 284 engages the harden-ed steel block I10 releasing the locking plate I50 and thus permitting free heightwise movement of the work table supporting assemblage. This condition obtains until the tool-operating shaft I6 has reached 345 of one cycle at which time the screw bolt 358 rides off one edge of the block I10 causing an abrupt and immediate relocking of the table in its operative position, the table remaining locked until during the next cycle the shaft 216 has again been rotated through to 195.

Considering briefly the burnishing action of the cam 296 on the tool 36 during the movements of both straps I92, 284 in opposite directions, it is to be noted that when the tool 36 occupies its uppermost inoperative position, the cam 296 occupies its lowermost position, as illustrated in dash lines in Fig. 9. The position of the tool and the cam at the time of work engagement of the tool is illustrated in Fig. 9 in full lines. The position of the tool after having reached the indentation depth and the corresponding position of the cam 296 isillustrated in Fig. 9 in dot and dash lines. When the tool is in its uppermost position, its rearmost hump portion is located above and at the rear of the foremost portion of the cam 296, the tool being held in this position by the spring 238. Consequently, when the tool is then moved downward and the cam 296 moved upward, the tool is cammed forward until the foremost portion'of the cam 296 is cleared by the tool, it being understood that the cam 296 at all times moves substantially in a vertical plane parallel to the line of feed. As illustrated best in Fig, 11, the cam 296 is of sufiicient extent transversely of the machine to maintain contact with the tool 36 in spite of the lateral motions of both straps I92 and 284. When the tool has reached its work-engaging position and immediately thereafter its indentation position, the tool is located foremost of the machine because in this position, the rearmost portion'of the tool hump and the foremost portion of the cam 296 are in contact with each other (see full lines in Fig. 9). Thereafter, the cam 296 continues to move upward while the tool is held immovable heightwise of the machine, a flat portion of the cam 296 then engaging a flat portion of the tool 36 with the result that the tool is permitted to be moved by the spring 238 rear ward of the machine while remaining in engagement with the work, thereby causing the indented portion of the work to be burnished. Thereafter, due to the reversal of the movement of the two straps I92, 284, the cam 296 is again moved downward-while the tool is still held'immovable heightwise of the machine (the abutment 2I0 of the strap I92 not yet having reengaged the projection 208 because this requires a certain amount of movement of the strap I92 upward from its low-* ermost position). By reason of this downward movement of the cam 296 relatively to the tool 36, the foremost portion of the cam 296 again is caused to approach the rearmost portion of the tool 36 with the result that the tool 36 is again forced outward of the machine to its outermost position thus performing another burnishing or ing screw 384.

rubbing action on the same indented portion of the work whereupon the tool is raised from the work by the continued upward movement of the front strap I92, Thus each indented portion of the shoe sole B is burnished twice before the tool can indent a contiguous portion of the work.

The illustrated machine has, as previously described, two different treadle rods 80 and I34 of which one serves to vary the speed of rotation of the countershaft 60 and the other one serves to elevate the work table supporting assemblage into its operative position. It is conceivable for purposes of more general consideration of this feature of the invention that the two treadle rods could be employed to perform other operations than those described above. Both rods may be operated either simultaneously or separately or successively in a certain order or in the reverse of that order by a single treadle mechanism. This treadle mechanism is illustrated best in Fig. of the drawings and reference may also be had to Figs. 1 and 3, The treadle mechanism comprises a Y-shaped frame or web 368, a portion of which is in the form of a cradle or bearing 36L The Y-shaped frame 360 is mounted for rotary motion heightwise of the machine on a fixed bracket 362 by means of alined fulcrum studs 364 (Fig. 15). The treadle rod I34 has a forked lower end 366 (Fig. 3) which is pivotally secured to the frame 360 by a pivot screw 368 (Fig. 15) to swing the Y-shaped frame 360 about the fulcrum studs 364, The frame 360 is provided with a tread plate 318 upon the depression of which the frame 366 is swung downward and the treadle rod I34is moved downward so as to elevate the work table supporting assemblage. The aforementioned spring I36 serves to maintain the Y-shaped frame 360 in an elevated position, the lower end of the spring I36 being secured to the frame 360 and the upper end being secured'to the top of the lower frame portion 28. The tread plate 316 is secured to the forward end of a treadle member in the form of a shaft 312 which is mounted for rotary motion about its own longitudinal axis in bearings 314 as well as in the cradle 36I, provided on the Y-shapedframe 368. Secured to the rear portion of the shaft 312 is a laterally extending arm 316, the free end of which is fork shaped and carries a swivel block 318 secured to it by a swivel pin 380, the lower end of the treadle rod 80 being threaded into the swivel block. As may be seen, rocking motion of the shaft 312 in one direction or the other as a result of a tilting movement imparted to the tread plate 310 will cause a swinging movement of the arm 316 about the axis of the shaft 312 and produce a corresponding upward or downward movement of the treadle rod 80 so as to increase or decrease the speed of the countershaft of the machine. To hold the treadle rod 88 and arm 316 normally elevated the lower portion of the rod 80 is engaged by the lower end of a spring 38I, the upper end of which is secured to the top of the frame portion 20. To limit the rocking motion of the shaft 312 in either direction, the forward portion of the shaft is provided with a split collar 382 (Figs 14 and 15) secured to the shaft by a clamp- The collar carries on a rearwardly extending plate two stop screws 386 which are arranged alternately to engage a fiat surface on the foremost bearing 314 of the shaft 312 to limit rotary motion of the shaft in both directions.

The operation of the machine will be apparent from the foregoing description but may be summarized as follows: A shoe, the sole or weltof which is to be indented, is placed upon the slightly inclined work table 34 in such a position relative to the operating instrumentalities of the machine that the indenting operation will begin at the heel breast line at one side of the shoe and will proceed from there along that side toward the toe end, around the toe portion and back along the other side of the shoe toward the hee1 breast line. By the depression of the tread plate 319 and the frame 368 of the treadle mechanism, the work table 34 with the shoe thereon is elevated into its operative position until the top face of thewelting or the projecting'margin of the outsole engages the shoe upper guard 38.

The principal happenings during one cycle'of operation beginning with the descent of the tool into engagement with the work are as follows:

As a result of the downward movement of the denting tool 36 on the work. Furthermore, the

upward movement of the rear strap 284 causes the elevation of the presser foot 41] into its inoperative position as described. While the indenting tool 36 remain in engagement with the work during the relative movement of the toolsupporting arm 262 and the front strap I92, the latter during that period moving through the lower arc of its orbital path, burnishing movements in a direction at right angles to the vertical plane through the line of feed F are imparted to the tool by the cam 296 supported on the rear strap 284, the burnishing movements being the result of the opposite movements of both straps I92 and 284 heightwise of the machine as well as the peculiar configuration of the cam-engaging portion of the tool 36 and of the cam 296. The tool, after having indented and burnished a portion of the work and by reason of the lateral movement of the strap I92 in the line of feed having been moved in that direction while pressing the work against the continuously rotating work table 34 and thereby having imparted a feed movement to the work, is elevated in the general direction of the path of its descent as soon as the now upwardly moving front strap I92 causes its abutment 2I0 to re-engage the projection 268 of the tool-supporting arm 202. During this upward movement of the front strap I92 the rear strap 284 moves downward and, consequently, the presser foot is permitted to come down upon the work to continue the latters feed movement by pressing the work against the work table and moving with the work table substantially in the line of feed. At the same time, the downward movement of the rear strap 284 causes a release of the table lock by the engagement of the screw stud 358 with the hardened steel block I19 of the table lock releasing mechanism. As a consequence of the release of the table lock, the work table 34 upon variation of the work thickness may automatically adjust itself heightwise, it being understood that the continued depression of the treadle maintains the table-supporting assemblage in its uppermost position during the entire machine operation. Thereafter, the movement of the two straps I92, 284 is reversed, the indenting tool again descending to engage a new portion of the work and the presser foot moving into its inoperative elevated position, while at the same time, the spring I14 is again released to lock the work table in its operative work-sustaining position.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. In an indenting machine, an indenting tool, a support for the indenting tool, and an eccentric for moving the tool support in a closed orbital path to impart to the tool a work indenting and a work feeding motion.

2. In an indenting machine, an indenting tool, a support for the indenting tool, a continuously rotating shaft, and an eccentric on the shaft for moving the tool support in a closed orbital path to impart to the tool a work indenting and a work feeding motion.

3. In an indenting machine, an indenting tool, a support for the indenting tool, an eccentric for moving the support in a closed orbital path to cause the tool to move bodily heightwise and transversely of the machine so as to indent the work and move in the direction of work feed.

4. In an indenting machine, an indenting tool, a support for the indenting tool, a continuously rotating shaft, and an eccentric on the shaft for moving the tool support in a closed orbital path to cause the tool to move bodily heightwise and transversely of the machine so as to indent the work and move in the direction of work feed.

5. In an indenting machine, an indenting tool, a support for the tool, an eccentric for moving the support in an orbital path, a tool-carrying member mounted on the support for movement relatively thereto, and means acting on the memher and tending to cause both the support and the member to move as a unit.

6. In' an indenting machine, an indenting tool, a support for the tool, an eccentric for moving the support in an orbital path, 'a tool-carrying member mounted on the support for movement relatively thereto, spring means acting on the member and tending to prevent movement of the member relatively to the support, and a stop for said member active when engaged by the latter to cause relative movement between the member and the support.

'7. In an indenting machine, a work support, an indenting tool, a tool support,'eccentric means for continuously moving the tool support in a closed orbital path heightwise and transversely of the machine, a tool carrying arm pivotally mounted on the support, spring means tending to 'prevent relative movement between the arm and the support. and an adjustable stop active on the downward movement of the support to engage the arm and terminate its downward movement while permitting continued downward movement of the support so as to determine the length of the downward stroke of the tool and the depth of the work indentation'produced by it.

8. In an indenting machine, a work support, an indenting tool, a tool support, eccentric means for continuously moving the tool support in a closed orbital path heightwise and transversely of the machine. a tool-carrying arm pivotally mounted on the support and spring-biased to participate in the movement of the support. a stop active on downward movement of the tool support to engage the arm and to terminate the downward movement of the tool after the latter has engaged the work and penetrated its surface to a predetermined indentation depth, the continued or bital movement of the tool support serving to move the arm transversely of the ma chine to impart to the tool a work feeding motion.

9. In an indenting machine, a work support, an indenting tool, a continuously rotating shaft, an eccentric on the shaft, an eccentric strap actuated by the eccentric, a tool-carrying arm mounted on the strap for movement relatively thereto, means for normally preventing relative movement between the strap and the arm, and a stop for engaging the arm once during each cycle of the eccentric to cause relative movement between the arm and the strap and to locate the tool at a predetermined position relatively the work support.

10. In an indenting machine, a work support, an indenting tool, a continuously rotating shaft, an eccentric on the shaft, a tool-supporting strap actuated by the eccentric to impart work-indenting and work-feeding motions to the tool, another eccentric on the shaft, a second strap actuated by the last-mentioned eccentric, and a tool-engaging cam on the second strap for imparting a burnishing motion to the tool.

11. In an indenting machine, a work support, an indenting tool, a continuously rotating shaft, an eccentric on the shaft, a tool-supporting strap actuated by the eccentric to impart work-indenting and work-feeding motions to the tool, a second eccentric on the shaft and disposed diametrically opposite the first-mentioned eccentric, a second strap actuated by the second eccentric memher, and a'cam mounted on the second strap for imparting repeated burnishing motions to the tool during each cycle of operation. r

12. In an indenting machine, an indenting tool, a continuously driven eccentric strap for imparting work-indenting and work-feeding motions to the tool, the strap carrying a fulcrum pin for the tool disposed parallel tothe vertical plane in the line of feed. and means for oscillating the tool about said pin to burnish the work.

13. In an indenting machine. an indenting tool. a continuously driven eccentricstrap supporting the tool and imparting to it work-indenting and work-feedin motions, a second continuously driven eccentric strap carrying a cam engaging the tool and imparting burnishing movements thereto, and a common fulcrum stud about which both straps are rocked.

14. In an indenting machine, a work support, means for adjusting the work support heightwise of the machine, means for locking the'work support in adjusted position, an indenting tool. a continuously driven eccentric strap supporting the tool and imparting to it work-indenting and work-feeding movements, a second continuously driven eccentric strap carrying a cam engaging the tool and imparting burnishing -movements thereto, and means carried by thesecond strap for intermittently releasing the said locking means.

15. In an indenting machine, an indenting tool. a continuously driven eccentric strap supporting the tool and imparting to it work-indenting and work-feeding motions, a second continuously driven eccentric strap carrying a cam en a ing the tool and imparting burnishing motions thereto, a common fulcrum stud about which both st a -s are rocked. and means for adjustim the fulcrum stud in a direction heightwise of the machine. I

to the work on v 16. In an indenting machine, a rotary work tahle,"means for rotating the work table at a constant peripheral velocity, an indenting tool, a support for the indenting tool, means'for moving the support downward to cause the tool to clamp the work against the table and for moving the support transversely of the machine to cause the tool tocooperate with the table in feeding the work, the tool being movable relatively to the support to compensate for any difierence in the rates of speed of the table and the support.

1'7. In an indenting machine, a rotary Work table, means for rotating the work table at a constant peripheral velocity, an indenting tool, a support for the indenting tool, means for moving the support downward to cause the tool to clamp the work against the table and to indent the surface of the work and for moving 'the support transversely of the machine to cause the tool to cooperate with the table in feeding the work, a pin carried by the tool support and extending at right angles to the vertical plane in the line of feed, a tool holder rotatable about said pin to compensate for any difference in the rates of speed of the table and the tool support, a fulcrum pin for the tool secured in said tool holder, and means for oscillating the tool about said fulcrum pin to cause the tool to burnish the indented portion of the work.

18. In an indenting machine, a work support, an indenting tool, a continuously rotating shaft, an eccentric on the shaft, a tool-supporting strap actuated by the eccentric to impart work-indenting and work-feeding motions to the tool, another eccentric on the shaft, a second strap actuated by the last-mentioned eccentric, a toolengaging cam on the second strap for imparting burnishing movements to the tool, and spring means tending to maintain the tool in contact with the cam.

19. In an indenting machine, a work support, an indenting tool, a support for the indenting tool, means for moving the tool support in a direction heightwise of the machine to cause the tool to indent 'the work, a cam for engagingthe tool and imparting burnishing movements thereto, means for moving the cam heightwise of the machine and in a direction opposite to the movement of the tool support. I

20. In an indenting machine, a rotary work table, means for rotating the work table at a constant peripheral velocity, an indenting tool, a support for the indenting tool, means for moving the tool support downward to cause the'tool to clamp the work against the table and for moving the tool support transversely of the machine to cause the tool to cooperate with the table in feeding the work, a pin secured in the tool support about which pin the tool is movable along the line of feed, and spring means tending to hold the tool in a substantially vertical position.

21. In an indenting machine, a work support,

means for adjusting the work support heightwise means for adjusting the work support heightwise of the machine, means normally operative to ice! the work support, an indenting tool, a support for the indenting tool, means for moving the tool support downward to cause the tool to indent the work, means for releasing the said looking means, a support for the lock releasing means movable in a direction opposite to the movement of the tool support so as to release the lock upon elevation of the tool.

23. In an indenting machine, a rotary work table, means for rotating the work table at a constant peripheral velocity, an indenting tool, a support for the indenting tool, a presser foot mounted for movement heightwise and transversely of the machine, and spring means for depressing the presser foot to hold the work against the table thereby imparting a feed movement to the work.

24. In an indenting machine, a rotary work table, means for rotating the work table at a constant peripheral velocity, an indenting tool, a support for the indenting tool, a presser foot mounted for movement heightwise of the machine and along the lineof feed, spring means for depressing the presser foot to clamp the work ,against the table and to participate in the work feeding movement of the table, and spring means for returning the presser foot to its initial position along the line of feed.

tion of an operating cycle to cause the tool to clamp the work against the table and to 'cooperate with the table in feeding the work, a presser foot mounted for movement heightwise and transversely ofthe machine, means for lowo .ering the presser foot during another portion of the same operating cycle for the purpose of causing the presser foot to clamp the work against the table and to continue its feed movement during the last-mentioned portion of the operating cycle.

'26. In an indenting machine, a continuously rotating work table, an indenting tool, and a presser foot, the tool and the presser foot alternately cooperating with the work table during a complete cycle of operation to cause a continuous feed of the work through the machine.

27. In an indenting machine, an indenting tool, a support for the indenting tool, means for moving 'the tool support downward to impart to the tool a work indenting and a work feeding motion during'a certain period of one cycle, a presser foot mounted for heightwise movement in the machine, yielding means tending to lower the'presser foot, and positively operated means for elevating the presser foot during the workfeeding period of the tool.

28. In'an' indenting machine, a continuously rotating work table, an indenting tool actuated to clamp the work against the work table durmg a predetermined portion of an operating cycle so as to feed the work, a presser foot actuated to clamp the work against the table during another predetermined portion of the same operating cycle so as to participate in the feed of the work, the movements of the tool and the presser foot in the direction of feed being so timed as to overlap.

29. In an indenting machine, an indenting tool movable heightwise and transversely of the machine, means for imparting awork feeding motion to the indenting tool after it has engaged the work,.a positively rotated work table a presser foot-movable heightwise andtransversely of the machine, and means for causingthe presser foot .to be rendered operative to cooperatewith the work table so as to participate in thefeed of the work immediately prior to thetermination of the work-feedingmotion of the tool.

30. In an indenting machine, a continuously rotated work table, an indenting tool, a continuously driven eccentric strap for imparting workindenting and work -feeding motions to the tool, a presser foot movable heightwise and transversely of the machine, yielding means for lowering the presser foot to cooperate with the work table in feeding the work, a second continuously driven eccentric strap carrying a cam for elevatingthe presser footduring a substantial portion ofthe feed movement of the tool.

31. In an indenting machine, .a, continuously ro'tatedwork table, an indenting tool, a continuously driven eccentric strap for imparting workindenting and work-feeding movements to the tool,, apresser ,foot movable heightwise and transversely of the machine, yielding means for lowering the presser foot to cooperate with the work table in feeding the work, a second continuously driven eccentric strap carrying a cam for both elevating th presser foot during a substantial portionof the feed. movement of the tool and for reciprocating the tool in a direction at right angles to the line of feed to burnish the indented portion of the work.

32. In an indentingmachine, a continuously rotated work table, means for adjusting the work table heightwise inthe machine, means for looking the ,work table in adjusted position, an indenting tool, asupport for the indenting tool,

' means for moving the support heightwise of the machine to impart to the tool a work indenting and a work feeding motion, a presser foot movable heightwise of the machine, a second support movableheightwise of the machine in a, direction opposite to the first-mentioned support, a cam on the second supportfor both elevating the presser foot during a substantial portion of the feed movement of the tool and imparting burnishing movements to the tool, and a lockreleasing mechanism on the second support operative to release the look upon elevation of the tool.

33. In an indenting machine, an indenting tool, a support for the indenting tool, eccentric means for continuously moving the tool support in a closed orbital path heightwise and transversely ofthe machine to impart to the tool a work indenting and a work feeding motion, a tool-carrying arm movably mounted on the support, and a guideway in said arm along which the tool is adjustable in the line of feed.

34. In an indenting machine, a work gage, an indenting tool, a support for the indenting tool, eccentric means for continuously moving the tool support in a closed onbital path heightwise and transversely of the machine to impart to the tool a work indenting and a work feeding motion, a tool-carrying arm movably mounted on the support, a guideway in said arm along which the tool is adjustable in a direction opposite to the direction of feed to assume a work engaging position beyond the vertical median plane of the machine so as to enable the tool in cooperation with the work table to force the work against the work gage.

35. In an indenting machine, a rotated work table having its center of rotation located in the vertical medianplane of the machine, a work gage, an indenting tool, a support for the indenting tool movable heightwise of the machine to cause the tool to indent the Work and movable transversely of the machine to impart to the tool a workfeeding motion during one portion of a cycle, a presser foot movable heightwise and transversely of the machine, and springmeans for depressing the presser foot to clamp the work against the rotatedtable so as to cooperate with the table in imparting a feed motion to the work during another portion of the same cycle, the presser foot engaging the Work at one side of the said median plane so as to tend'to force the work against the work gage.

36. In an indenting machine for operating on welted shoes, an indenting tool, means for moving the indenting tool into the welt crease to indent the welt, a guard for protecting the shoe upper against the' tool and for determining the heightwise and horizontal position of the shoe, and meansfor adjusting the guard heightwise of the machine.

37. Inan indenting machine for operating on welted shoes, an indenting to'ol, means for moving the indenting tool into the welt crease to indent the welt, a guard for protecting the shoe upper against the tool and for determining the heightwise and horizontal position of the Work, the guard comprising a pivotally mounted web carrying a, plate of spring steel adapted to engage the shoeupper, and means for adjusting the web heightwise of the machine.

38. In an indenting machine, an indenting tool, a movable work support assemblage comprising a rotary work table and mechanism for rotating the table, a, cam for moving the assemblage into operative position, and treadle-controlled means for operating the cam.

39. In an indenting machine, an indenting tool, a movable work support assemblage comprising a rotary Work table and mechanism for rotating the table, a cam for moving the assemblage into operative position, treadle-controlled means for operating the cam, and spring means tending to move the assemblage into its inoperative position.

40. In an indenting machine, an indenting tool, a frame portion, an overhang on said frame portion, a pin for connecting the overhangwith the frame portion, a workv support assemblage movable heightwise oi the machine along said pin and comprising a, rotary work table and means for rotating the table, and treadle-controlled cam means for moving the assemblage into operative position.

41. In an indenting machine, an indenting tool, a work' support assemblage comprising a rotary work table and means for rotating the table, a cam for moving the assemblage into operative position, treadle-controlled means for operating the cam, and means for locking the work support assemblage in operative position.

42. In an indenting machine, an indenting tool, means for operating the tool, a movable work support assemblage comprising a rotary Work table and means for rotating the table, treadle-controlled cam means for moving the assemblage into operative position, means for locking the assemblage inoperative position, and means actuated by the tool operating means for intermittently releasing the locking means.

43. In an indenting machine, an indenting tool, a, support for the indenting tool, a tool- 

